Improving the Results of Bone Marrow Transplantation for Patients With Severe Congenital Anemias

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People with severe congenital anemias, such as sickle cell anemia and beta-thalassemia, have been cured with bone marrow transplantation (BMT). The procedure, however, is limited to children younger than the age of 16 because the risks are lower for children than for adults.

The purpose of this study is to explore the use of a BMT regimen that, instead of chemotherapy, uses a low dose of radiation, combined with two immunosuppressive drugs. This type BMT procedure is described as nonmyeloablative, meaning that it does not destroy the patient s bone marrow. It is hoped that this type of BMT will be safe for patients normally excluded from the procedure because of their age and other reasons.

To participate in this study, patients must be between the ages of 18 and 65 and have a sibling who is a well-matched stem-cell donor. Beyond the standard BMT protocol, study participants will undergo additional procedures. The donor will receive G-CSF by injection for five days; then his or her stem cells will be collected and frozen one month prior to BMT. Approximately one month later, the patient will be given two immune-suppressing drugs, Campath 1-H and Sirolimus, as well as a single low dose of total body irradiation and then the cells from the donor will be infused.

Prior to their participation in this study, patients will undergo the following evaluations: a physical exam, blood work, breathing tests, heart-function tests, chest and sinus x-rays, and bone-marrow sampling.

Nonmyeloablative allogeneic peripheral blood stem cell (PBSC) transplants are currently being investigated in phase I/II trials assessing engraftment, efficacy, and toxicity at a number of transplant centers. Preliminary data have shown a high rate of complete donor engraftment with a relatively low toxicity profile. The decreased risk of transplant-related complications associated with nonmyeloablative transplants expands eligibility to patients with nonmalignant hematological disorders curable by allogeneic transplantation; however, significant toxicity with current regimens persists including severe graft-versus-host-disease (GVHD) leading to significant morbidity and mortality. Moreover, mixed chimerism has been shown to be sufficient to induce clinical remissions in children with nonmalignant hematologic disorders undergoing conventional allogeneic transplantation. Therefore, newer regimens need to be developed that are more applicable to patients with non-malignant disorders in whom no graft vs. leukemia effect is needed, and where mixed chimerism is sufficient for disease amelioration.

In this protocol, we propose transplantation in patients with severe beta-globin disorders including sickle cell disease (SCD), and beta-thalassemia, considered at high risk for complications from or ineligible for standard BMT, with allogeneic PBSCs from an HLA identical sibling using a novel immunosuppressive regimen without myeloablation in an attempt to further decrease the transplant related morbidity/mortality. The low intensity nonmyeloablative conditioning regimen will consist of low dose radiation, Alemtuzumab (Campath ) and Sirolimus (Rapamune ) as a strategy to provide adequate immunosuppression to allow sufficient engraftment for clinical remission with a lower risk of GVHD development. T-cell replete, donor-derived, granulocyte colony stimulating factor (filgrastim, G-CSF) mobilized PBSCs will be used to establish hematopoietic and lymphoid reconstitution.

The primary endpoint of this study is treatment success at one year, defined as full donor type hemoglobin on hemoglobin electrophoresis for patients with SCD and transfusion-independence for patients with beta-thalassemia. Other end points include degree of donor-host chimerism necessary for long-term graft survival and disease amelioration, incidence of acute and chronic graft-vs-host disease (GVHD), incidence of graft rejection, transplant related morbidity, as well as disease-free and overall survival.

treatment success at one year, defined as full donor type hemoglobin on hemoglobin electrophoresis for patients with SCD and transfusion-independence for patients with thalassemia and DBA. [ Time Frame: 1 year ]

This trial is designed to estimate treatment success, which is anticipated to be about 80%. The study started with a sample size of 25 and this will allow us to estimate the success of engraftment. For example, if the estimated rate is .80, the 95% confidence interval would be approximately (.64, .96). This would allow us to rule out rate of treatment success of less than .64. If the estimated rate is .70, the 95% confidence interval would be approximately (.52, .88) and we could rule out rate of treatment success below .50. If the lower bound of the 95% confidence interval is raised to 0.7, the number of subjects needed to accrue with respect to success rate is listed below.

Secondary Outcome Measures :

The level of chimerism required to maintain both graft survival as well as hematologic normalcy. The chimeric status of patients will be measured on days, +30, +60 and +100 by microsatellite analysis of the peripheral blood. More frequent monito... [ Time Frame: +30, +60, +100, 1year, 2year ]

The chimeric status of patients will be measured on days, +30, +60 and +100 by microsatellite analysis of the peripheral blood. More frequent monitoring may be required. [ Time Frame: days +30, +60, +100, 1 year, 2 year ]

Incidence of acute and chronic GVHD or relapse rate. GvHD or relapse together count together toward the combined endpoint for regimen failure [ Time Frame: 1 year ]

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Layout table for eligibility information

Ages Eligible for Study:

2 Years to 65 Years (Child, Adult, Older Adult)

Sexes Eligible for Study:

All

Accepts Healthy Volunteers:

Yes

Criteria

INCLUSION CRITERIA:

RECIPIENTS:

Must fulfill one disease category from below:

DISEASE SPECIFIC:

Patients with sickle cell disease at high risk for disease related morbidity or mortality, defined by having irreversible end organ damage (A, B, C, D or E) or potentially reversible complication(s) not ameliorated by hydroxyurea (F):

A. Stroke defined as a clinically significant neurologic event that is accompanied by and infarct on cerebral MRI

OR

an abnormal trans-cranial Doppler examination ( greater than or equal to 200m/s);

OR

B. Sickle cell related renal insufficiency defined by a creatinine level greater than or equal to 1.5 times the upper limit of normal and kidney biopsy consistent with sickle cell nephropathy OR nephritic syndrome OR creatinine clearance less than 60mL/min/1.73m(2) for patients less than or equal to 16 years of age or less than 50mL/min for patients greater than or equal to 16 years of age OR requiring peritoneal or hemodialysis

OR

Age is less than or equal to 5 years of age with the upper limit of normal serum creatinine 0.8mg/dl

Age is greater than 5 years or less than or equal to 10 years of age with the upper limit of normal serum creatinine 1.0mg/dl

Age is greater than 10 years and less than or equal to 15 years of agethe the upper limit of normal serum creatinine 1.2mg/dl

Age greater than 15 years of age with the upper limit of normal serum creatinine 1.3mg/dl

C. Tricuspid regurgitant jet velocity (TRV) of greater than or equal to 2.5m/s in patients greater than or equal to 18 years of age at least 3 weeks after a vaso- occlusive crisis, OR

D. Recurrent tricorporal praipism defined as at least two episodes of an erection lasting greater than or equal to 4 hours involving the corpora cavernosa and corpus spongiosa, OR

E. Sickle hepatopathy defined as EITHER ferritin greater than 100mcg/L OR direct bilirubin greater than 0.4 mg/dL at baseline in patients greater than or equal to 18 years of age; OR

F. Any one of the below complications:

Vaso-occlusive crisis:

Eligible for hydroxyurea at least 3 hospital admissions in the last year

Eligible for HSCT More than 1 hospital admission per year while on maximal tolerated dose of hydroxyurea

Acute Chest Syndrome (ACS):

Eligible for hydroxyurea: 2 prior ACS while greater than 3 years of age and adequately treated for asthma

Eligible for HSCT: any ACS while on hydroxyurea*

Osteonecrosis of 2 or more joints:

Eligible for hydroxyurea: And significantly affecting their quality of life by Karnofsky score 50-60

Eligible for HSCT: And on hydroxyurea* where total hemoglobin increase less than 1g/dL or fetal hemoglobin increases less than 2.5 time the baseline level

Red cell alloimmunization:

Eligible for hydroxyurea: Transfusion dependent

Eligible for HSCT: Total hemoglobin increase less htan 1 g/dL while on hydroxyurea*

hydroxyurea at maximum tolerated dose

Patients with beta-thalassemia who have grade 2 or 3 iron overload, determined by the presence of 2 or more of the following:

portal fibrosis by liver biopsy

inadequate chelation history (defined as failure to maintain adequate compliance with chelation with desferoxamine initiated within 18 months of the first transfusion and administered subcutaneously for 8-10 hours at least 5 days each week)

Hepatomegaly of greater than 2 cm below the costochondral margin

NON-DISEASE SPECIFIC:

Ages greater than or equal to 4 years

6/6 HLA matched family donor available

Ability to comprehend and willing to sign an informed consent, assent obtained from minors

Negative serum beta-HCG

Pediatric patients less than 16 years of age must decline myeloablative bone marrow transplantation

DONOR:

6/6 HLA identical family donor

Weight greater than or equal to 20 kg (in so far that weight difference between recipient and donor does not exceed a reasonable likelihood of being able to obtain an adequate cell dose from the donor within two aphereses)